| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D060112.4 | NIM/SKYRAD/M1 - IRTs do not agree with AERI | nimskyrad60sM1.b1 |
| D060222.1 | NIM/SKYRAD/M1 - Instrument ventilator problem | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| D060321.3 | NIM/SONDE/M1 - RH data incorrect. | nimsondewnpnM1.b1 |
| D060419.4 | NIM/MWR/M1 - Instrument noise problem/RF interference | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
| D060718.1 | NIM/MWR/M1 - Radiometer occasionally overheating | nimmwrlosM1.b1, nimmwrtipM1.a1 |
| D060915.1 | NIM/SKYRAD/M1 - Unknown problem with PIR1 | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| D060927.1 | NIM/MWR/M1 - Sun in field of view of radiometer | nimmwrlosM1.b1 |
| D061006.1 | NIM/SKYRAD/M1 - Tracker inoperative | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 11/26/2005 | 0000 | 06/07/2006 | 1900 |
| Subject: | NIM/SKYRAD/M1 - IRTs do not agree with AERI |
| DataStreams: | nimskyrad60sM1.b1 |
| Description: | Since deployment at PYE, and then at NIM, the AMF SKYRAD IRT measured about 10K higher sky temperatures than the AERI and the MWRP IRT measureed about 20K higher than the AERI. Several actions were taken to diagnose the problem including confirming the correct configuration of the IRTs and data logger, cleaning the mirror and lens, and replacing the mirror. After several days of rain beginning 6/2/2006, the three instruments came into agreement. It is unknown whether this was a problem with the AERI, MWRP-IRT or SKYRAD-IRT. |
| Measurements: | nimskyrad60sM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 12/23/2005 | 0000 | 02/23/2006 | 0800 |
| Subject: | NIM/SKYRAD/M1 - Instrument ventilator problem |
| DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| Description: | Data quality office first reported that PIR1 and PIR2 appear to be deviating more than typical during the daylight hours. It was found that the Skyrad PIR ventilator fans were building up debris on the intake air filter. Obstructed air flow results in solar heating of the PIR ventilator housing in the later part of the day and biasing the incomming IR irradiance values. The slow buildup was insidious and wasn't discovered and corrected (i.e. ventilator fans cleaned on a regular and frequent basis) until Feb 23rd. On or around December 23rd was when this problem may have first started. We are unable to quantify the extent of the problem in W/m2. Normal deviation between PIRs is typically 3-5 W/m2. |
| Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 03/11/2006 | 0500 | 03/11/2006 | 0501 |
| Subject: | NIM/SONDE/M1 - RH data incorrect. |
| DataStreams: | nimsondewnpnM1.b1 |
| Description: | RH% values oscillate between ambient values and 0%. The 0% RH values are incorrect. |
| Measurements: | nimsondewnpnM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|
| Subject: | NIM/MWR/M1 - Instrument noise problem/RF interference |
| DataStreams: | nimmwrM1.00, nimmwrlosM1.b1, nimmwrtipM1.a1 |
| Description: | Data are affected by intermittent spikes that become more frequent starting in March 2006. Spikes affect data mostly around 9 AM and 18:00 PM. The origin of the spikes is probably RF interference. |
| Measurements: | nimmwrlosM1.b1:
nimmwrM1.00:
nimmwrtipM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|
| Subject: | NIM/MWR/M1 - Radiometer occasionally overheating |
| DataStreams: | nimmwrlosM1.b1, nimmwrtipM1.a1 |
| Description: | The radiometer is occasionally thermally unstable. The thermal instability occurs when the air temperature exceeds approximately 42.8 degree C (about 316-317 K). This has been happening since March. The most affected months are March, May, and June. |
| Measurements: | nimmwrlosM1.b1:
nimmwrtipM1.a1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/02/2006 | 0000 | 09/19/2006 | 0745 |
| Subject: | NIM/SKYRAD/M1 - Unknown problem with PIR1 |
| DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| Description: | Spikes in Shaded 1 occur frequently during this time period, resulting in differences b/t shaded1 and shaded2 exceeding 20W/m2. Instrument connections were checked and a spare PIR instrument was tried in the place of PIR1 (shaded1). After returning the original PIR1 to its original location data again looked good and very close to PIR2. Problem appears resolved but exact cure is unknown. |
| Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/01/2006 | 0000 | 08/31/2006 | 2300 |
| Subject: | NIM/MWR/M1 - Sun in field of view of radiometer |
| DataStreams: | nimmwrlosM1.b1 |
| Description: | Around 12 pm every day between 8/1 and 8/31 there is an increase in the brightness temperature due to the sun being in the field of view of the radiometer. |
| Measurements: | nimmwrlosM1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/12/2006 | 1200 | 10/05/2006 | 1330 |
| Subject: | NIM/SKYRAD/M1 - Tracker inoperative |
| DataStreams: | nimskyradM1.00, nimskyrad20sM1.a0, nimskyrad60sM1.b1 |
| Description: | Starting on 9/12 the NIM radiometer tracker drifted enough due to sinking supports and a drifting clock that the direct normal measurments (NIP) and the downwelling hemispheric diffuse shortwave measurments (8-48) were adversely affected in the afternoon hours. The shortwave hemispheric global instrument (PSP) and downelling hemispheric longwave shaded1 and shaded2 (PIR) are unaffected by this problem. The tracker problem greatly affected direct measurements and affected the diffuse measurement to a lesser extent. There are no redundant measurements for these instruments. However, during this time range the data collected before local noon (aprox 1140GMT) for all shortwave Skyrad instruments appear to be good. |
| Measurements: | nimskyrad20sM1.a0:
nimskyrad60sM1.b1:
nimskyradM1.00:
|